A searchable database of physical, mechanical, electrical, chemical and thermal properties, covering metals, alloys, plastics, ceramics, and composites. Data are sourced from a combination of academic and commercial sources.

An open access project providing computational data and models for a comprehensive range of materials. Access is free but requires registration. A collaboration between MIT and the Lawrence Berkeley National Laboratory.

Data evaluated by the National Institute for Standards and Technology (NIST). Includes physical constants, atomic and molecular data, properties and substances.

Provides "structures and enthalpy of formation data for stable and metastable structures of many alloy systems". Provided by a Physics research group at Carnegie Mellon University.

A repository of small molecule crystal structures. The CSD System also comprises software for database access, structure visualization and data analysis, and structural knowledge bases derived from the CSD. Contact Prof. Rory Waterman for access.